Re: [PATCH] iio: hid: hid-sensor-accel-3d: Add second ACC sensor support

[Bastien Nocera <hadess@hadess.net>]

On Fri, 2017-03-17 at 01:21 +0000, Song, Hongyan wrote:
> Hi,
> 	Thanks for your comments. But I am not sure what your "type"
> mean.

I mean the connector type, which you use to differentiate the 2
accelerometers. You should export this data instead of changing the
name of the sensor.

> If you mean "sensor type", I expose it as second ACC, the sensor type
> is the same with the exist ACC,
> It cannot be used as a distinction.
> If you mean the "connection type" I used in the patch, "connection
> type" is only defined in HID driver,
> It is not a common property in IIO. So not good to expose it out.
> 
> 
> BR
> Song Hongyan  
> 
> -----Original Message-----
> From: Bastien Nocera [mailto:hadess@hadess.net] 
> Sent: Thursday, March 16, 2017 8:02 PM
> To: Song, Hongyan <hongyan.song@intel.com>; linux-input@vger.kernel.o
> rg; linux-iio@vger.kernel.org
> Cc: jikos@kernel.org; jic23@kernel.org; Pandruvada, Srinivas <sriniva
> s.pandruvada@intel.com>
> Subject: Re: [PATCH] iio: hid: hid-sensor-accel-3d: Add second ACC
> sensor support
> 
> On Thu, 2017-03-16 at 18:20 +0800, Song Hongyan wrote:
> > As accelerometer sensor becomes more and more popular, there are
> > more 
> > user scenarios have been developed, "Hinge" is a very important 
> > usecase which needs two accelerometer sensors to calculate the 
> > included angle of keyboard and screen.
> > In this case, two accelerometer sensors will be exposed.
> > Currently, 
> > IIO interface hasn't other way to distinguish two sensors with
> > same 
> > sensor type, except sensor name. So a new sensor name
> > "accel_2nd_3d"
> > is added for secondary accelerometer sensor.
> > 
> > In HID level, connection type is a good common property to 
> > differentiate two sensors with same sensor type.
> 
> I've been told in the past not to rely on device names in iio-sensor-
> proxy, and this would go against this advice.
> 
> As you have a "type" to export, why not export that instead?
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